configs/stm32f469_disco_sd_defconfig: bump U-Boot version to 2023.04

Bump U-Boot to version 2023.04.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

configs/stm32f469_disco_sd_defconfig

@@ -21,7 +21,7 @@ BR2_TARGET_ROOTFS_EXT2_SIZE="32M"
 BR2_TARGET_UBOOT=y
 BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
 BR2_TARGET_UBOOT_CUSTOM_VERSION=y
-BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2021.10"
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2023.04"
 BR2_TARGET_UBOOT_BOARD_DEFCONFIG="stm32f469-discovery"
 BR2_TARGET_UBOOT_NEEDS_OPENSSL=y
 BR2_PACKAGE_HOST_DOSFSTOOLS=y